Q: Who are the thirteen researchers of darkness?
A: Thirteen seekers of darkness that share a consciousness and heart with Master Xehanort, serving as raw material for the X-Blade. In this game, they failed in their attempts to make Sora the 13th of their ranks, but who's to become the 13th in his stead? And who are the six whose identities have not been revealed?

Q: What happened to Terra's heart and body?
A: In this game, Master Xehanort does not appear in the form of Terra-Xehanort when he transferred his heart, but as the old man he was before he took control of Terra's body. During the revival, what happened to Terra's body, and Terra's heart that was in opposition to Xehanort's control? In Kingdom Hearts, Birth by Sleep, it is to be considered that it was thought the whereabouts of the heart of Terra's master, Eraqus rested within his body.

Q: What happens to Lea hereafter now that he has become a Keyblade wielder?
A: Lea, having returned to his human form, chosen by the Keyblade. Does him getting a Keyblade have anything to do with his best friend Roxas? And is there a possibility that Lea's become one of the protectors of Light?

Q: Who are the seven protectors of light?
A: The current whereabouts of Terra, Aqua, and Ventus, who are to become part of the seven protectors of light in opposition to the thirteen seekers of darkness (with the exception of their 13th member), are currently unknown. Can they return to Sora? Who is the last member?

Q: When do Riku and Terra meet again?
A: In Kingdom Hearts: Birth by Sleep, Terra made a promise to Riku, "anyway, when you reach me, let's teach the world the power to protect the ones we love, and the truly spacious world we live in", in case he should ever succeed him. It appears Riku has remembered this promise, but when will the two ever meet again?

Q. The decisions about Xehanort and revivals from sleep.
Not counting Terra and his friends, there are Roxas, Namine and Xion as well, all lying in sleep as they wait for their sadness to be mended. If they wake up, they'll come to Sora's aid, right? Surely they'll put an end to their long-lasting battle with Xehanort the next time.... won't they?!